Automatic focusing system for use in cameras having zooming func

Details Automatic focusing system for use in cameras having zooming func Automatic focusing system for use in cameras having zooming func

1991-07-10

1993-11-30

Mancuso, Joseph

Facsimile and static presentation processing

Facsimile

Recording apparatus

358225, 354402, H04N 5232, H04N 5225

Patent

active

052670449

ABSTRACT:
An auto focus apparatus for a camera comprising a group of lenses which include a focus lens and a zoom lens. The auto focus apparatus also comprises a focus detector, a motor and a controller. The focus detector detects whether the camera is in focus or not. The motor drives the focus lens and zoom lens. The controller controls the motor for driving the zoom lens and the focus lens. When the focus detector does not detect a focused image through the focus lens, the zoom lens is then driven to focus the camera. A method of auto focusing comprises the step of driving a focus lens so as to obtain a focusing point. The method of auto focusing also comprises the steps of detecting whether the camera is in focus or not, and driving the zoom lens when a focusing point is not achieved by the focus lens.

REFERENCES:
patent: 4320417 (1982-03-01), Hanma
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patent: 4969044 (1990-11-01), Hijikata et al.
patent: 5060001 (1991-10-01), Kaneda
patent: 5061954 (1991-10-01), Toyama et al.
patent: 5113214 (1992-05-01), Nagata et al.
Ishida et al., "Auto focusing in TV camera by using peak value servo system," NHK Technical Research, vol. 17, No. 1, 1965.

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